EBARA ENR Instruction And Maintenance Manual - page 19
19
(ENGLISH)
6.2 Piping
(1) Avoid force transmission from suction and
discharge pipes to pump by installing strong
enough supports.
(2) Install check valves (between the pump and
the discharge valve) in the following cases:
- Very long pipes.
- When the manometric head is high.
- In automatic operation position.
- When supplying to a pressure tank.
- In parallel operation.
(3) Install automatic vent valves at those points
where the formation of air pockets cannot be
avoided. Nevertheless, they should not be pla-
ced in locations where the pressure is lower
than atmospheric pressure. In those cases the
vent valves draw in air instead of take it out.
(4) To reduce the effect of water hammer, install
a non-return valve with spring.
(5) Installations with suction lift (see Fig. 1):
- The end of the suction pipe has to be installed
at least twice as deep as the pipe diameter (2D),
and at the same time, 1 to 1.5D from the bottom
of the tank.
- Install a foot valve with a strainer in the end of
the suction pipe to avoid the intake of strange
particles.
- Suction pipe must be installed with an upward
slope (>1%) towards the pump to avoid the for-
mation of air pockets. Joints of pipes and acces-
sories will be carefully done to prevent air inta-
ke.
- Make sure that the suction pipe is as short and
straight as possible, avoiding bends and unne-
cessary pipe lines. Do not install any shutoff
valve in this part of installation.
SPECIFICATIONS
Nominal nozzle side, DN
32 ~ 350 (DIN 2532 PN10, EN 1092-2)
Range
Maximun speed
3000 r.p.m./50 Hz ~ 3600 r.p.m./60 Hz
Capacity / Head (max.)
2000 m3/h / 150 m.c.a.
Characteristics
Clean liquids
Fluids
Temperature
-20 ~ +120º C
+120 ~ +170º C
Maximun allowable pressure
16 / 10
(1)
/ 14
(2)
bar
14 / 9
(1)
/ 8
(2)
bar
Pump casing
Cast iron GG25
Materials
Impeller
Cast iron GG25
Bronze G-CuSn10
Shaft
Stainless steel AISI 420 (1.4021)
Shaft sleeve
Stainless steel AISI 420 (1.4021)
Impeller type
Closed radial
Construction
Bearings
Greased ball bearings
Shaft seal
Mechanical seal Silicon carbide / Carbon / EPDM
(3)
Drive
Motor
Electric, explosion, steam
Common base
Accesories
With motor
Coupling
Coupling guard
Sahft seal
Gland packing: flax fiber / PTFE
Optional
Bearings
Oil lubricated ball bearings
Coupling
Coupling with spacer
Flanges
Standard ANSI 150
(1)
Pump sizes from 80-400 to 300-500, except 150-500
(2)
Pump size 150-500
(3)
Check operation limits depending on pumped fluid
Table 1